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\bibitem[Boolos 1998]{Boolos1998c}
\abntrefinfo{Boolos}{BOOLOS}{1998}
{BOOLOS, G. ``{The Consistency of Frege's Foundations of Arithmetic}''. In:
  \emph{Logic, Logic, and Logic}. Cambridge, Massachusetts: Harvard University
  Press, 1998. p. 183--201.}

\bibitem[Demopoulos 1995a]{Demopoulos1995}
\abntrefinfo{Demopoulos}{DEMOPOULOS}{1995a}
{DEMOPOULOS, W. (Ed.). \emph{Frege's Philosophy of Mathematics}. Cambridge,
  Massachusetts: Harvard University Press, 1995a.}

\bibitem[Demopoulos 1995b]{Demopoulos1995a}
\abntrefinfo{Demopoulos}{DEMOPOULOS}{1995b}
{DEMOPOULOS, W. Frege and rigorization of analysis. In:  \emph{Frege's
  Philosophy of Mathematics}. Cambridge, Massachusetts: Harvard University
  Press, 1995b. p. 68--88.}

\bibitem[Frege 1962]{Frege1962}
\abntrefinfo{Frege}{FREGE}{1962}
{FREGE, G. \emph{Grundgesetze der Arithmetik}. Hildesheim: Georg Olms Verlag,
  1962. I e II.}

\bibitem[Frege 1988]{Frege1988}
\abntrefinfo{Frege}{FREGE}{1988}
{FREGE, G. \emph{Die Grundlagen der Arithmetik. Eine logisch mathematische
  Untersuchung {\"u}ber den Begriff der Zahl}. Hamburg: Felix Meiner Verlag,
  1988.}

\bibitem[Frege 1998]{Frege1998}
\abntrefinfo{Frege}{FREGE}{1998}
{FREGE, G. \emph{Begriffsschrift und andere Aufs{\"a}tze}. Hildesheim: George
  Olms Verlag, 1998.}

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